Abstract
The reactions of [Pt 2(μ-E) 2(PPh 3) 4] (E = S, Se) with cis-1,4-dichlorobut-2-ene ( cis-ClCH 2CH CHCH 2Cl) give the dichalcogenolate complexes [Pt 2(μ-ECH 2CH CHCH 2E)(PPh 3) 4] 2+; an X-ray structure determination on the thiolate complex was carried out. The complexes give the expected dications in ESI mass spectra recorded at very low cone voltages, but at moderate cone voltages undergo facile fragmentation via a retro-Diels–Alder reaction and loss of 1,3-butadiene, giving the dichalcogenide species [Pt 2(μ-E 2)(PPh 3) 4] 2+. Analogous species containing bidentate phosphine or arsine ligands have been previously generated electrochemically, and studied theoretically.
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